Gamer completes GTA IV 360 in 17 mins 15 secs?

According to the Rockstar Social Club’s ‘100% Club’ – which lists everyone who’s completed the game, obviously – a certain ninjaraiden2003 has completed GTA IV on the Xbox 360 in 17 minutes and 15 seconds.

Now with all those stories circulating the web about cheating, the question has to be asked: Is this some kind of workaround or simply an anomaly on Rockstar’s part?